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Mirrors > Home > ILE Home > Th. List > df-id | Unicode version |
Description: Define the identity
relation. Definition 9.15 of [Quine] p. 64. For
example, 5 ![]() ![]() ![]() |
Ref | Expression |
---|---|
df-id |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cid 4284 |
. 2
![]() ![]() | |
2 | vx |
. . . 4
![]() ![]() | |
3 | vy |
. . . 4
![]() ![]() | |
4 | 2, 3 | weq 1503 |
. . 3
![]() ![]() ![]() ![]() |
5 | 4, 2, 3 | copab 4060 |
. 2
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
6 | 1, 5 | wceq 1353 |
1
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Colors of variables: wff set class |
This definition is referenced by: reli 4751 ideqg 4773 opabresid 4955 cnvi 5028 dffun2 5221 ider 6561 cnmptid 13414 |
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